The article is really about the babblers' attempt to address charges of 'bad writing' on, you guessed it, theoretical grounds. Amongst the other justifications proffered, the following is priceless: "the language of "good writing" is inadequate to "the experience of women and minorities" (McCumber, p. 66), who are bound to speak an unfamiliar language as they acquire equal rights and political power."
I always thought that the role of the Humanities was to inspire a love of learning in students, not provoke revolution. I guess it's fortunate that these people write so badly that no one outside of their closed circle reads them. If they actually wrote well they might be dangerous, rather than merely ridiculous.